Description:
------------
---
From manual page: http://www.php.net/function.strtotime#refsect1-function.strtotime-parameters
---

A string of '+1 day 2 hours 3 minutes 4 seconds' works.
A string of '-1 day 2 hours 3 minutes 4 seconds' doesn't work.

Test script:
---------------
    $time = strtotime('+3 days 2 hours 3 minutes 4 seconds') - time();
    $expectedDiff =
      3 * 24 * 60 * 60 +
      2 * 60 * 60 +
      3 * 60 +
      4;

    $time = strtotime('-3 days 2 hours 3 minutes 4 seconds') - time();
    $expectedDiff =
      3 * 24 * 60 * 60 +
      2 * 60 * 60 +
      3 * 60 +
      4;

Expected result:
----------------
+ and - should be the same.

Actual result:
--------------
+ is correct. - is wrong.